http://fundementals.sourceforge.net/

The collection consists of:

Utility functions:
String operations, Dynamic array operations, System functions and Date & Time operations.

Unicode functions:
Unicode codecs and Unicode character and string functions.

Streams:
Common stream implementations that includes parsing support and binary packing.

Datastructures:
Commonly used data structures, including efficient array and dictionary implementations.

Sockets:
UDP and TCP server and client classes. Support for asynchronous or threaded modes.

Mathematics:
Units included for vectors, matrices, rational numbers and complex numbers.
maar nog belangrijker:

There are no restrictions on the use of these libraries in your applications, including commercial applications.
En wat ik zo heb gezien, erg veel handige units.